ICD-10 Code I60.31 – Nontraumatic subarachnoid hemorrhage from right posterior communicating artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I60.31 – Nontraumatic subarachnoid hemorrhage from right posterior communicating artery
What it is
This code identifies a spontaneous subarachnoid hemorrhage caused by bleeding from the right posterior communicating artery. It is used when the source is nontraumatic and the right-sided vessel is documented.
Clinical signs
Patients often present with sudden severe headache, nausea, neck stiffness, altered mental status, or neurologic deficits. Clinical features vary; refer to documentation and imaging or specialist notes when available.
When to use this code
Use I60.31 when the record clearly states a nontraumatic subarachnoid hemorrhage arising from the right posterior communicating artery. You should also use it when imaging, angiography, or neurosurgical documentation identifies that exact source. If the laterality or vessel is not specified, check documentation before assigning this code.
Do not use for
Do not use this code for traumatic subarachnoid hemorrhage or for hemorrhage from a different intracranial vessel. Do not assume laterality if the right side is not documented.
Coding tip
Confirm both the nontraumatic cause and the exact right posterior communicating artery source before coding.